Water pan structure

Abstract

The utility model discloses a water pan structure which comprises a water pan, a middle frame and a water receiving groove which are sequentially distributed from top to bottom. The water receiving groove is provided with a water guide groove and a convex enclosure frame which are both of a concentric-square-shaped structure, the water guide groove is irregularly inclined, the convex enclosure frame is fixed along the inner ring of the water guide groove and is higher than the water guide groove, the water receiving groove comprises a first water drainage pipe and a second water drainage pipe, and the first water drainage pipe and the second water drainage pipe are distributed on the opposite angles of the water guide groove and are both used for water drainage; the middle frame is fittingly fixed on the gutter, and the water tray is horizontally mounted on the middle frame. According to the utility model, the water pan structure which is assembled up and down is adopted, on one hand, the condenser is supported, on the other hand, the condensate water is guided, the condensate water generated by the condenser is dripped on the water pan and flows downwards and quickly into the water guide groove of the water pan along the water pan, and the water guide groove is of an irregular inclined structure, so that the condensate water is prevented from falling off. Therefore, the water flow is gathered to the drain pipe and discharged to a designated point along the drain pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioner condensate drainage, and specifically relates to a water receiving tray structure. Background Art

[0002] During defrosting or heating, the outdoor finned heat exchanger of commercial air conditioners and heat pump water heaters will generate condensate. At present, most of the outdoor finned heat exchangers of air conditioners and heat pump water heaters on the market are directly placed on a horizontal water receiving tray, and the condensate directly flows away from the drainage holes on the tray.

[0003] The above drainage structure has the following risks in ultra-low temperature environments:

[0004] 1. The condensate cannot flow away quickly on the horizontal water receiving tray, and will freeze on the water receiving tray, affecting the drainage effect of the water receiving tray.

[0005] 2. If the condensate is not discharged in time, the place where the fin heat exchanger contacts the water tray is easily frozen by the condensate, and the ice will gradually extend upward, affecting the heat exchange efficiency of the heat exchanger during the operation of the air conditioner.

[0006] 3. The condensate is discharged randomly through the drainage holes, which is likely to cause the ground to freeze in cold regions, posing a safety hazard to pedestrians. Content of the Utility Model

[0007] The utility model provides a water receiving tray structure that is safer and more reliable to use, which can solve at least one of the above technical problems.

[0008] To solve the above technical problems, the utility model adopts the following technical scheme: A water receiving tray structure includes a water tray, a middle frame, and a water receiving groove that are distributed in sequence from top to bottom;

[0009] The water receiving groove is provided with a water guiding groove and a convex surrounding frame that are both in a circular structure. The water guiding groove is in an irregular inclined shape. The convex surrounding frame is fixed along the inner circle of the water guiding groove and has a height higher than that of the water guiding groove. The water receiving groove includes a first drain pipe and a second drain pipe. The first drain pipe and the second drain pipe are distributed at the diagonals of the water guiding groove and are both used for drainage;

[0010] The middle frame is fixedly fitted on the water guiding groove, fits and surrounds the outside of the convex surrounding frame, and has the same height as the convex surrounding frame. Second kidney-shaped holes for drainage are distributed on the edge of the middle frame;

[0011] The water tray is horizontally installed on the middle frame and presses on the convex surrounding frame, and first kidney-shaped holes for drainage are distributed on the edge of the water tray.

[0012] Further, the water receiving tank includes a first half-tank and a second half-tank that are spliced and matched. The first half-tank includes a first water guiding groove A and a first water guiding groove B, and the second half-tank includes a second water guiding groove A and a second water guiding groove B;

[0013] The first water guiding groove B and the second water guiding groove B are spaced apart and disposed at both ends of the water receiving tank. There are two first water guiding grooves A, which are arranged in parallel and respectively connected to both ends of the first water guiding groove B. There are two second water guiding grooves A, which are arranged in parallel and respectively connected to both ends of the second water guiding groove B. The first water guiding groove A and the second water guiding groove A on the same side of the water receiving tank are connected to form the water guiding groove in a loop structure.

[0014] Further, both the first water guiding groove A and the second water guiding groove A include a fixed end and a splicing end. The fixed end of the first water guiding groove A or the second water guiding groove A is connected to the first water guiding groove B or the second water guiding groove B. The splicing ends of the first water guiding groove A and the second water guiding groove A are connected to each other, and the height of the splicing end is higher than the height of the fixed end. The groove body of the first water guiding groove A or the second water guiding groove A shows a trend of being higher at the splicing end and lower at the fixed end.

[0015] Further, the first half-tank further includes a first drain pipe. One end of the first water guiding groove B is provided with a first drain hole. The groove body of the first water guiding groove B slopes downward towards the end where the first drain hole is located. The first drain pipe is located at the bottom of the first water guiding groove B and communicates with the first drain hole.

[0016] Further, the second half-tank further includes a second drain pipe. One end of the second water guiding groove B is provided with a second drain hole. The second drain hole and the first drain hole are distributed diagonally in the water guiding groove. The groove body of the second water guiding groove B slopes downward towards the end where the second drain hole is located. The second drain pipe is located at the bottom of the second water guiding groove B and communicates with the second drain hole.

[0017] Further, the first half-tank further includes a first convex surrounding frame in a C-shaped structure, which is erected along the inner circle of the first half-tank. The second half-tank further includes a second convex surrounding frame in a C-shaped structure, which is erected along the inner circle of the second half-tank. The first convex surrounding frame and the second convex surrounding frame are spliced and matched to form the convex surrounding frame in a loop structure.

[0018] Further, a second flanging is horizontally arranged along the periphery at the top of the water guiding groove. The middle frame is in a loop structure and is fixedly erected on the water guiding groove along the second flanging and fits and abuts against the convex surrounding frame. The second kidney-shaped hole is located above the water guiding groove.

[0019] Further, the top of the middle frame is horizontally flush with the top of the convex surrounding frame, and a connecting plate is fixed in the middle of the middle frame. The connecting plate presses on the top of the convex surrounding frame. There are two water trays, which are symmetrically installed on both sides of the connecting plate and cover the top of the middle frame.

[0020] Further, the condenser is placed on the water tray. The water tray is provided with a first flanging along the periphery. The condenser fin heat exchanger is placed at the first kidney-shaped hole, and the first kidney-shaped hole is located above the water guiding groove.

[0021] Further, the outer surfaces of the water tray, the middle frame and the water receiving tank are evenly sprayed with plastic powder for anti-corrosion and anti-rust.

[0022] The beneficial effects of the present utility model are embodied in:

[0023] The present utility model adopts an upper and lower assembled water receiving tray structure. On the one hand, it plays a role in supporting the condenser, separating the condenser from the ground by a certain distance, preventing the condenser from sticking to the ground due to the condensation of condensed water in a low-temperature environment, and avoiding affecting the heat exchange efficiency of the fin heat exchanger; on the other hand, it plays a role in guiding the condensed water. The condensed water generated by the condenser drips onto the water tray and quickly flows downward along the water tray into the water guiding groove of the water receiving tank. Since the water guiding groove itself has an irregular inclined structure, the water flow can converge to the drain pipe and be discharged to the designated point along the drain pipe, preventing the ground from icing and causing safety hazards, avoiding the condensation of condensed water on the water tray in a low-temperature environment and affecting the drainage effect of the water receiving tray, and also avoiding the icing of condensed water on the water tray from extending upward to the fin heat exchanger and affecting the heat exchange efficiency. Description of the Drawings

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application.

[0025] Figure 1 It is an exploded view of the overall structure of an embodiment of the present utility model.

[0026] Figure 2 It is a front view of the overall structure of an embodiment of the present utility model.

[0027] Figure 3 It is a schematic diagram of the disassembly of the water receiving tank of an embodiment of the present utility model.

[0028] Figure 4 It is a top view of the first half groove of an embodiment of the present utility model.

[0029] Figure 5 It is an axonometric view of the water receiving tank of an embodiment of the present utility model.

[0030] The markings of each component in the drawings are as follows: 1, water tray; 101, first flanging; 102, first kidney-shaped hole; 2, middle frame; 201, connecting plate; 202, second kidney-shaped hole; 3, water receiving trough; 4, first half trough; 401, first water guiding trough A; 402, first water guiding trough B; 403, first drain pipe; 404, first drain hole; 405, first convex surrounding frame; 5, second half trough; 501, second water guiding trough A; 502, second water guiding trough B; 503, second drain pipe; 504, second drain hole; 505, second convex surrounding frame; 6, second flanging. Detailed implementation mode

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, "a plurality" means two or more.

[0033] See Figures 1 - 2 , the embodiment of the present invention provides a water receiving tray structure, including a water tray 1, a middle frame 2, and a water receiving trough 3 that are distributed in sequence from top to bottom;

[0034] The water receiving trough 3 is provided with a water guiding trough and a convex surrounding frame that are both in a loop structure. The water guiding trough is in an irregular inclined shape. The convex surrounding frame is fixed along the inner circle of the water guiding trough and has a height higher than that of the water guiding trough. The water receiving trough 3 includes a first drain pipe 403 and a second drain pipe 503. The first drain pipe 403 and the second drain pipe 503 are distributed at the diagonals of the water guiding trough and are both used for drainage;

[0035] The middle frame 2 is fixedly fitted on the water guiding trough, fits and surrounds the outside of the convex surrounding frame, and has the same height as the convex surrounding frame. The edge of the middle frame 2 is distributed with second kidney-shaped holes 202 for drainage;

[0036] The water tray 1 is horizontally installed on the middle frame 2, presses on the convex surrounding frame, and the edge of the water tray 1 is distributed with first kidney-shaped holes 102 for draining water.

[0037] The water receiving tray structure of the present utility model is assembled up and down. On the one hand, it plays a role in supporting the condenser, separating the condenser from the ground by a certain distance, preventing the condenser from adhering to the ground due to the condensation of condensed water in a low-temperature environment, and avoiding affecting the heat exchange efficiency of the fin heat exchanger. On the other hand, it plays a role in guiding the condensed water. The condensed water generated by the condenser drips onto the water tray and quickly flows downward along the water tray into the water guiding groove of the water receiving tank. Because the water guiding groove itself has an irregular inclined structure, the water flow can converge to the drain pipe and be discharged to the designated point along the drain pipe, preventing the ground from icing and causing potential safety hazards, avoiding the condensation of condensed water on the water tray in a low-temperature environment and affecting the drainage effect of the water receiving tray, and also avoiding the icing of condensed water on the water tray from extending upward to the fin heat exchanger and affecting the heat exchange efficiency.

[0038] See Figures 3 - 5 , in this embodiment, the water receiving tank 3 includes a first half-tank 4 and a second half-tank 5 that are spliced and matched. The first half-tank 4 includes a first water guiding groove A401 and a first water guiding groove B402. The second half-tank 5 includes a second water guiding groove A501 and a second water guiding groove B502;

[0039] The first water guiding groove B402 and the second water guiding groove B502 are spaced apart and arranged at both ends of the water receiving tank 3. There are two first water guiding grooves A401, which are arranged in parallel and respectively connected to both ends of the first water guiding groove B402. There are two second water guiding grooves A501, which are arranged in parallel and respectively connected to both ends of the second water guiding groove B502. The first water guiding groove A401 and the second water guiding groove A501 on the same side of the water receiving tank 3 are connected to form the water guiding groove with a loop structure.

[0040] With such a design, the water receiving tank 3 is assembled by splicing two half-tanks instead of being integrally formed, improving the simplicity of production and manufacturing. The condensed water drips onto the water tray 1, flows downward into the middle frame 2, and finally flows into the water guiding groove and is discharged along the drain pipe on the water guiding groove.

[0041] See Figures 3 - 5, in this embodiment, both the first water guide trough A401 and the second water guide trough A501 include a fixed end and a splicing end. The fixed end of the first water guide trough A401 or the second water guide trough A501 is connected to the first water guide trough B402 or the second water guide trough B502. The splicing ends of the first water guide trough A401 and the second water guide trough A501 are connected to each other, and the height of the splicing end is higher than that of the fixed end. The trough body of the first water guide trough A401 or the second water guide trough A501 has a trend of being higher at the splicing end and lower at the fixed end. With such a design, the condensed water flowing downward from the water tray 1 into the water guide trough can flow along the inclined first water guide trough A401 and the second water guide trough A501 to the first water guide trough B402 or the second water guide trough B502, avoiding water accumulation and improper drainage, and preventing the water flow from condensing on the water guide trough in a low-temperature environment.

[0042] See Figures 3 - 5 , in this embodiment, the first half trough 4 further includes a first drain pipe 403. One end of the first water guide trough B402 is provided with a first drain hole 404. The trough body of the first water guide trough B402 has a downward inclination towards the end where the first drain hole 404 is located. The first drain pipe 403 is located at the bottom of the first water guide trough B402 and is connected to the first drain hole 404;

[0043] The second half trough 5 further includes a second drain pipe 503. One end of the second water guide trough B502 is provided with a second drain hole 504. The second drain hole 504 and the first drain hole 404 are distributed diagonally on the water guide trough. The trough body of the second water guide trough B502 has a downward inclination towards the end where the second drain hole 504 is located. The second drain pipe 503 is located at the bottom of the second water guide trough B502 and is connected to the second drain hole 504.

[0044] With such a design, since the first water guide trough B402 and the second water guide trough B502 themselves also have an inclined structure, the water flow finally flows to the first drain pipe 403 or the second drain pipe 503. The first drain pipe 403 and the second drain pipe 503 can be externally connected to a water pipe to lead the water flow to a designated discharge point. At the same time, since the first drain pipe 403 and the second drain pipe 503 are distributed in a diagonal structure, it can not only save the manufacturing cost of the device but also does not affect the normal discharge of the condensed water.

[0045] See Figures 3 - 5In this embodiment, the first half trough 4 further includes a first convex frame 405 in a C-shaped structure, and the first convex frame 405 is set up along the inner circle of the first half trough 4. The second half trough 5 further includes a second convex frame 505 in a C-shaped structure, and the second convex frame 505 is set up along the inner circle of the second half trough 5. The first convex frame 405 and the second convex frame 505 are spliced ​​and matched to form the convex frame in a round-shaped structure. In this design, the convex frame is higher than the water diversion trough and matches with the inner circle of the water diversion trough, which facilitates the assembly of the middle frame 2 on the water receiving trough 3.

[0046] See also Figure 1 and Figure 5 In this embodiment, a second flange 6 is horizontally arranged along the periphery of the top of the water diversion trough. The middle frame 2 is a circular structure, fixedly mounted on the water diversion trough along the second flange 6, and fits against the convex frame. The second waist-shaped hole 202 is located above the water diversion trough. With this design, the middle frame 2 matches the water receiving trough 3 and is fixed on the top of the water receiving trough 3. There are multiple second waist-shaped holes 202, which are distributed along the edge of the middle frame 2 and are located directly above the water diversion trough. The condensed water flowing down from the water tray 1 to the middle frame 2 flows down along the second waist-shaped holes 202 to the water diversion trough, and finally converges to the drain pipe for discharge.

[0047] See also Figures 1 - 2 In this embodiment, the top of the middle frame 2 is flush with the top of the convex frame, and a connecting plate 201 is fixed in the middle of the middle frame 2, and the connecting plate 201 is pressed on the top of the convex frame. The water pan 1 has two, which are symmetrically installed on both sides of the connecting plate 201 and cover the top of the middle frame 2. With this design, the two water pans 1 are horizontally placed on the top of the water receiving pan structure, and the condenser is placed on the water receiving pan structure. On the one hand, the water receiving pan structure supports the condenser so that the condenser is separated from the ground by a distance to avoid condensation of condensed water in a low temperature environment and causing the condenser to adhere to the ground. On the other hand, it receives the condensed water generated by the condenser and discharges the condensed water along the setting of the drain pipe.

[0048] It should be noted that the condenser in this application includes but is not limited to an air conditioner and a heat pump water heater.

[0049] See also Figures 1 - 2, in this embodiment, the condenser is placed on the water tray 1. The water tray 1 is provided with a first flanging 101 along its periphery. The condenser fin heat exchanger is placed at the first kidney-shaped hole 102, and the first kidney-shaped hole 102 is located above the water diversion trough. With such a design, there are multiple first kidney-shaped holes 102, which are spaced along the edge of the water tray 1 and are directly above the water diversion trough. Condensed water or rainwater drips onto the water tray 1 and is held by the first flanging 101 to prevent overflow. The condensed water generated by the condenser can directly drain down to the middle frame 2 through the first kidney-shaped hole 102 along the fin heat exchanger, quickly completing the discharge of the condensed water and avoiding the condensation of condensed water on the water tray 1 in a low-temperature environment, which may affect the heat exchange efficiency of the fin heat exchanger.

[0050] See Figures 1 - 2 , in this embodiment, the outer surfaces of the water tray 1, the middle frame 2, and the water receiving trough 3 are evenly sprayed with plastic powder for anti-corrosion and anti-rust. With such a design, if the water receiving tray structure is not treated for anti-corrosion and anti-rust, its service life will be severely damaged when condensed water or rainwater drips along the water tray 1 onto the water receiving trough 3 for a long time. Therefore, in this application, the plastic powder spraying method is used to protect the water receiving tray structure to extend its service life and improve the use safety.

[0051] In another embodiment, the present utility model also provides a water receiving tray structure, which includes a water tray 1 and a water receiving trough 3 distributed in sequence from top to bottom. Compared with the previous embodiment, this embodiment does not include the middle frame 2. The water receiving trough 3 in this embodiment only includes a water diversion trough in a loop structure and does not include a convex surrounding frame in a loop structure. The water tray 1 is horizontally installed on the water receiving trough 3, and other features are the same as those in the previous embodiment, so they will not be elaborated here.

[0052] In summary, the present utility model adopts an up-and-down assembled water receiving tray structure. On the one hand, it plays a role in supporting the condenser, separating the condenser from the ground by a certain distance, preventing the condenser from sticking to the ground due to the condensation of condensed water in a low-temperature environment, and avoiding affecting the heat exchange efficiency of the fin heat exchanger;

[0053] On the other hand, it plays a role in guiding the condensed water. The condensed water generated by the condenser drips onto the water tray and quickly flows downward along the water tray into the water diversion trough of the water receiving trough. Due to the irregular inclined structure of the water diversion trough itself, the water flow can converge into the drain pipe and be discharged to the designated point along the drain pipe, preventing the ground from freezing and causing potential safety hazards, avoiding the condensation of condensed water on the water tray in a low-temperature environment, which may affect the drainage effect of the water receiving tray, and also avoiding the ice formed by the condensed water on the water tray from extending upward to the fin heat exchanger and affecting the heat exchange efficiency.

[0054] It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the present utility model. Those skilled in the art can make various modifications or changes based on it. Any modification, equivalent replacement, improvement, etc., made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A water receiving tray structure, characterized in that: It comprises a water tray (1), a middle frame (2) and a water receiving trough (3) which are arranged in sequence from top to bottom; The water receiving trough (3) is provided with a water diversion trough and a convex surrounding frame both of which are in a zigzag structure. The water diversion trough is irregularly inclined. The convex surrounding frame is fixed along the inner circle of the water diversion trough and its height is higher than that of the water diversion trough. The water receiving trough (3) comprises a first drainage pipe (403) and a second drainage pipe (503). The first drainage pipe (403) and the second drainage pipe (503) are distributed at the diagonal positions of the water diversion trough and are both used for drainage. The middle frame (2) is fixedly fitted on the water diversion trough, and is fitted around the outer side of the convex surrounding frame and has the same height as the convex surrounding frame. The edge of the middle frame (2) is provided with second waist-shaped holes (202) for drainage; The water tray (1) is horizontally mounted on the middle frame (2) and covers the convex frame, and first waist-shaped holes (102) for drainage are distributed on the edge of the water tray (1).

2. The water receiving tray structure according to claim 1, characterized in that: The water receiving trough (3) comprises a first half trough (4) and a second half trough (5) which are spliced ​​and matched, the first half trough (4) comprises a first water diversion trough A (401) and a first water diversion trough B (402), and the second half trough (5) comprises a second water diversion trough A (501) and a second water diversion trough B (502); The first water diversion trough B (402) and the second water diversion trough B (502) are spaced apart at the two ends of the water receiving trough (3); the first water diversion trough A (401) has two parallel water diversion troughs, which are respectively connected to the two ends of the first water diversion trough B (402); the second water diversion trough A (501) has two parallel water diversion troughs, which are respectively connected to the two ends of the second water diversion trough B (502); the first water diversion trough A (401) and the second water diversion trough A (501) located on the same side of the water receiving trough (3) are connected to each other, forming a water diversion trough with a round-shaped structure.

3. The water receiving tray structure according to claim 2, characterized in that: The first water diversion trough A (401) and the second water diversion trough A (501) both include a fixed end and a splicing end. The fixed end of the first water diversion trough A (401) or the second water diversion trough A (501) is connected to the first water diversion trough B (402) or the second water diversion trough B (502). The splicing ends of the first water diversion trough A (401) and the second water diversion trough A (501) are connected to each other, and the height of the splicing end is higher than the height of the fixed end. The trough body of the first water diversion trough A (401) or the second water diversion trough A (501) is in a trend of having the splicing end higher and the fixed end lower.

4. The water receiving tray structure according to claim 2, characterized in that: The first half trough (4) also includes a first drainage pipe (403), a first drainage hole (404) is provided at one end of the first water diversion trough B (402), the trough body of the first water diversion trough B (402) is inclined downward toward the end where the first drainage hole (404) is located, and the first drainage pipe (403) is located at the bottom of the first water diversion trough B (402) and is connected to the first drainage hole (404).

5. The water receiving tray structure according to claim 4, characterized in that: The second half trough (5) further comprises a second drainage pipe (503), a second drainage hole (504) is provided at one end of the second water diversion trough B (502), the second drainage hole (504) and the first drainage hole (404) are distributed at the diagonal of the water diversion trough, the trough body of the second water diversion trough B (502) is inclined downward toward the end where the second drainage hole (504) is located, and the second drainage pipe (503) is located at the bottom of the second water diversion trough B (502) and is connected to the second drainage hole (504).

6. The water receiving tray structure according to claim 2, characterized in that: The first half groove (4) further comprises a first convex frame (405) in a C-shaped structure, the first convex frame (405) being arranged along the inner circle of the first half groove (4), the second half groove (5) further comprises a second convex frame (505) in a C-shaped structure, the second convex frame (505) being arranged along the inner circle of the second half groove (5), the first convex frame (405) and the second convex frame (505) being spliced ​​and matched with each other to form the convex frame in a round-shaped structure.

7. The water receiving tray structure according to claim 1, characterized in that: A second flange (6) is horizontally arranged along the periphery of the top of the water diversion trough; the middle frame (2) is in a circular structure, fixedly mounted on the water diversion trough along the second flange (6) and abutting against the convex frame; the second waist-shaped hole (202) is located above the water diversion trough.

8. The water receiving tray structure according to claim 1, characterized in that: The top of the middle frame (2) is flush with the top of the convex frame, and a connecting plate (201) is fixed in the middle of the middle frame (2), the connecting plate (201) is pressed on the top of the convex frame, and the water tray (1) has two, which are symmetrically mounted on both sides of the connecting plate (201) and cover the top of the middle frame (2).

9. The water receiving tray structure according to claim 1, characterized in that: The condenser is placed on the water tray (1), the water tray (1) is provided with a first flange (101) along the periphery, the condenser fin heat exchanger is placed at the first waist-shaped hole (102), and the first waist-shaped hole (102) is located above the water inlet groove.

10. The water receiving tray structure according to claim 1, characterized in that: The surfaces of the water tray (1), the middle frame (2) and the water receiving trough (3) are evenly sprayed with plastic powder for preventing corrosion and rust.

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